See the calculation with sample numbers
350 sq ft of paintable wall, 2 coats, 350 sq ft per gallon, and 10% extra requires 2.2 gallons—or 3 one-gallon cans.
What can change the result?
Paint coverage varies by product, surface, color, and application. Confirm the label before buying.
Painting older homes? This quantity calculator is not safety guidance. Review the EPA Renovation, Repair and Painting Program when work may disturb paint in pre-1978 housing.
How this was calculated: Net paintable area, gallons needed, rounded containers, optional primer separately.